Automation System
Direct Numerical Control means:

None of these
using several computers to control one large machine
complete elimination of a need for a human operator.
eliminating computers from the manufacturing process
using one computer to control several machines

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Automation System
CAE and CAM are linked through:

a common data base and communications system
None of these
assembly automation and tool production.
parts production and testing
NC tape programming and automated design

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Automation System
Digital signals:

can have three possible levels
have a frequency measured in units of hertz
None of these
have a sinusoidal shape.
are assigned values of 1 or 0 depending on the voltage level

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Automation System
There are several procedures you can implement to provide maximum security. The most important of these is:

do not allow unbonded service people to work on your equipment
None of these
Verify the reputation of the people installing your system
run regular simulated tests using TARP (testing of Applications Recovery Planes)
do not leave training manuals unsecured

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